Add Job Cluster Support

[williamdphillips]

Instead of requiring a cluster id to be provided during nutter execution, can job cluster support be added? In our use case, we would only need to supply policy id and not an entire cluster configuration, although if this is implemented it seems like it would make sense to support full-fledge integration with the jobs 2.1 API and creating a job cluster.

Even if the parameter for executing this allowed the cluster configuration to be passed through to the 2.1 api execution, it would be very useful in scenarios where you don't want to have your tests executing on an interactive cluster but instead be run as a job on a job cluster.

If more details are required of this ask please respond back, and I'll try to better articulate my statement above.

[htuomola]

I'm not a maintainer but it was surpsingly quick to add minimal support. I've only done little testing but it did run the job.. See PR #82